package com.xxxx.server.config.websocketconfig;

import com.xxxx.server.config.jwt.JwtTokenUtil;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.util.StringUtils;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
    @Value("${jwt.tokenHead}")
    private String tokenHead;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    //注入登录逻辑
    @Autowired
    private UserDetailsService userDetailsService;
    /**
     * 添加这个Endpoint,这样在网页中可以通过Websocket连接上服务
     * 也就是我们配置websocket的服务地址，并且可以指定是否使用socketJs
     * @param registry
     */
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        /**
         * 1.将ws/ep路径注册为stomp的端点，用户连接了这个端点就可以进行websocket通讯支持socketJs
         * 2.setAllowedOrigins("*"):允许跨域
         * 3。withSockJs():支持socketJS访问
         */
        registry.addEndpoint("/ws/ep").setAllowedOrigins("*").withSockJS();
    }


    @Override
    public void configureClientOutboundChannel(ChannelRegistration registration) {
     registration.interceptors(new ChannelInterceptor() {
         @Override
         public Message<?> preSend(Message<?> message, MessageChannel channel) {
             StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);
             //判断是否为连接,如果是，需要获取token，并且设置用户对象
             if(StompCommand.CONNECT.equals(accessor.getCommand())){
                 String token = accessor.getFirstNativeHeader("Auth-Token");
                 if(!StringUtils.isEmpty(token)){
                     String authToken=token.substring(tokenHead.length());
                     String username=jwtTokenUtil.getUserNameFromToken(authToken);
                     //token存在用户名
                     if(!StringUtils.isEmpty(username)){
                         //登录
                         UserDetails userDetails=userDetailsService.loadUserByUsername(username);
                         //验证token是否失效，重新设置用户对象
                         if(jwtTokenUtil.validateToken(authToken,userDetails)){
                             UsernamePasswordAuthenticationToken authenticationToken=
                                 new UsernamePasswordAuthenticationToken(userDetails,null,
                                         userDetails.getAuthorities());
                             //Security全局上下文中设置用户对象
                             SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                             //还需要在assessor中设置用户
                             accessor.setUser(authenticationToken);
                         }
                     }
                 }

             }
             return message;
         }
     });


    }

    /**
     * 配置消息代理
     * @param registry
     */
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
     //配置代理域，可以配置多个，配纸袋里目的地前缀为/queue,可以在配置域上向客户添加消息
        registry.enableSimpleBroker("/queue");
    }
}
